ORCID Profile
0000-0001-8116-6747
Current Organisation
Nanyang Technological University
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Publisher: Cambridge University Press (CUP)
Date: 18-03-2019
DOI: 10.1017/S0885715619000150
Abstract: Apatite-type materials A I 4 A II 6 (BO 4 ) 6 X 2 have two unique cations sites A I and A II , which can host large mono-, di- tri- and tetra-valent cations. The average cation radii will affect the twist angle and lattice constants. However, there are few reports on the influence of B site substitutions on the twist angle and lattice parameters. It is believed that the lattice constant variation as a function of B site substitutions may not follow the same twist-angle model as proposed for A site. This work reports our results on the crystal chemistry of synthetic apatite Ca 10 (V x P 1−x O 4 ) 6 F 2 obtained through the crystal structure characterization using Rietveld refinement and high-resolution transmission electron microscopy. The quantification of vanadium hosphorus partitioning in BO 4 tetrahedra showed that equilibrium with more than 70% substitution of phosphorous by vanadium was difficult to achieve unless longer annealing (about 1 week at 900 °C) was employed. In comparison with the apatites with different ionic radii at A I and A II sites, Ca 10 (V x P 1−x O 4 ) 6 F 2 apatites with different ionic radii at B site show little twist angle variation for the whole series, which indicates that the dilation of unit cell constants is mainly because of the expansions of BO 4 tetrahedra when A site cation is fixed.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 03-2021
Publisher: Springer Science and Business Media LLC
Date: 04-03-2019
Publisher: AIP Publishing
Date: 31-07-2023
DOI: 10.1063/5.0160714
Abstract: Based on the correlation between Raman shift and bond parameters, and further combined with experimental values of the Raman shift composition effect, the relationship between the composition and bond parameters of the 2D-M1−xM′xX2 and 2D-MX′2xX2(1−x) alloy materials was established. Numerical reproduction of the measurements clarified that the host atom phonons involved interaction with all of its z neighbors, whereas the doping atom phonon only involved interaction with a dimer. The doping of large atoms resulted in an elongation of the bond length, an increase in the equivalent coordination number, and enhancement of the binding energy. The doping of small atoms led to a contraction of the bond length, a decrease in the equivalent coordination number, and a weakening of binding energy. By quantifying the relationship between composition and bond parameters from Raman shifts, a deep understanding of two-dimensional alloy properties can be achieved.
Publisher: American Chemical Society (ACS)
Date: 21-08-2017
No related grants have been discovered for ZhiLi Dong.